The cartoon says they like it, not that they're proud of it.
Liking the way you were born is healthy.
But being proud of a circumstance of your birth, when you obviously had no control over it, is problematic regardless of what it is. Black, white, boy, girl, American, Mexican, no difference. Now if we are ever at war I would hope we would all be proud to be Americans. And I understand black pride as a necessary defense mechanism against a world that prefers whiteness on many levels. But the need or excuse for both types of pride should be temporary. In general pride should only be applied to things you've done, not things you were born into.

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